2007 CHEVROLET SUBURBAN overheating

Engine Coolant
The cooling system in your vehicle is lled with
DEX-COOL®engine coolant. This coolant is
designed to remain in your vehicle for ve years or
150,000 miles (240 000 km), whichever occurs
rst, if you add only DEX-COOL
®extended
life coolant.
The following explains your cooling system and
how to add coolant when it is low. If you have
a problem with engine overheating, seeEngine
Overheating on page 473.A 50/50 mixture of clean, drinkable water and
DEX-COOL
®coolant will:
Give freezing protection down to
−34°F (−37°C).
Give boiling protection up to 265°F (129°C).
Protect against rust and corrosion.
Help keep the proper engine temperature.
Let the warning lights and gages work as they
should.
Notice:Using coolant other than DEX-COOL
®
may cause premature engine, heater core, or
radiator corrosion. In addition, the engine
coolant may require changing sooner, at the
rst maintenance service after each
30,000 miles (50 000 km) or 24 months,
whichever occurs rst. Any repairs would not
be covered by your warranty. Always use
DEX-COOL
®(silicate-free) coolant in your
vehicle.
470

Coolant Surge Tank Pressure Cap
Notice:If the pressure cap is not tightly
installed, coolant loss and possible engine
damage may occur. Be sure the cap is properly
and tightly secured.
The coolant surge tank pressure cap must be fully
installed on the coolant surge tank. SeeEngine
Compartment Overview on page 458for more
information on location.
Engine Overheating
You will nd a coolant temperature gage on your
vehicle’s instrument panel. SeeEngine Coolant
Temperature Gage on page 252.
In addition, you will nd an ENGINE
OVERHEATED STOP ENGINE, ENGINE
OVERHEATED IDLE ENGINE, and an ENGINE
POWER IS REDUCED message in the Driver
Information Center (DIC) on the instrument panel.
SeeDIC Warnings and Messages on page 270.
473

Cooling System
When you decide it is safe to lift the hood, here is
what you will see:
A. Coolant Surge Tank
B. Coolant Surge Tank Pressure Cap
C. Engine Cooling Fan(s){CAUTION:
An electric fan under the hood can start up
and injure you even when the engine is not
running. Keep hands, clothing, and tools
away from any underhood electric fan.
If the coolant inside the coolant surge tank is
boiling, do not do anything else until it cools down.
If possible, the vehicle should be parked on a
level surface. Check the coolant level after
the system cools down. Some amount of coolant
may be lost due to overheating.
5.3L Engine (4.8L and 6.0L Similar)
477

Tires
Your new vehicle comes with high-quality tires
made by a leading tire manufacturer. If you ever
have questions about your tire warranty and where
to obtain service, see your GM Warranty booklet for
details. For additional information refer to the tire
manufacturer’s booklet included with your vehicle.
{CAUTION:
Poorly maintained and improperly used
tires are dangerous.
Overloading your vehicle’s tires can
cause overheating as a result of too
much friction. You could have an
air-out and a serious accident. See
Loading Your Vehicle on page 407.
Underinated tires pose the same
danger as overloaded tires. The
resulting accident could cause serious
injury. Check all tires frequently to
maintain the recommended pressure.
CAUTION: (Continued)
CAUTION: (Continued)
Tire pressure should be checked
when your vehicle’s tires are cold. See
Inflation - Tire Pressure on page 515.
Overinated tires are more likely to be
cut, punctured, or broken by a sudden
impact — such as when you hit a
pothole. Keep tires at the
recommended pressure.
Worn, old tires can cause accidents. If
the tire’s tread is badly worn, or if your
vehicle’s tires have been damaged,
replace them.
20-Inch Tires
If your vehicle has the optional 20-inch
P275/55R20 size tires, they are classied as
touring tires and are designed for on road use. The
low-prole, wide tread design is not recommended
for off-road driving. SeeOff-Road Driving on
page 372, for additional information.
507

Engine (cont.)
Oil Life System........................................ 462
Overheated Protection Operating Mode...... 476
Overheating............................................. 473
Starting.................................................... 141
Entry Lighting.............................................. 220
Event Data Recorders (EDR)...................... 609
Exit Lighting................................................ 220
Extender, Safety Belt..................................... 60
Exterior Lamps............................................ 215
F
Filter
Engine Air Cleaner................................... 464
Finish Damage............................................ 560
Flashers, Hazard Warning........................... 204
Flash-to-Pass.............................................. 207
Flat Tire...................................................... 531
Flat Tire, Changing...................................... 532
Flat Tire, Storing......................................... 547
Fluid
Automatic Transmission............................ 466
Power Steering........................................ 484
Windshield Washer.................................. 485Fog Lamp
Fog .......................................................... 218
Fog Lamp Light........................................... 258
Four-Wheel Drive...............................150, 497
Front Axle................................................... 498
Fuel............................................................ 446
Additives.................................................. 448
California Fuel.......................................... 447
E85 (85% Ethanol)................................... 449
Filling a Portable Fuel Container.............. 455
Filling Your Tank...................................... 451
Fuels in Foreign Countries....................... 450
Gage....................................................... 259
Gasoline Octane...................................... 447
Gasoline Specications............................ 447
Low Warning Light................................... 260
Fuses
Center Instrument Panel Fuse Block........ 566
Fuses and Circuit Breakers...................... 564
Instrument Panel Fuse Block................... 565
Underhood Fuse Block............................. 567
Windshield Wiper..................................... 564
624